The present work was devoted to the experimental study of the multiphase flow around inclusions in both Newtonian and non-Newtonian media at respectively microscopic and mesoscopic scales, by means of the particle image velocimetry (PIV and µ-PIV) and fast camera visualization.

Bubbles and drops have been studied experimentally since the formation, rising, coalescence and fragmentation. Bubbles in micro-mixers has been studied and characterized by measuring the velocity fields. Different parameters, such as the shear stress, the geometry of the micro-mixer, the flow rates or the physical properties were tested to develop power law correlation.

The deformation of a liquid-liquid interface due to the passage of an inclusion was investigated by original experiments to describe the dynamics of the phenomenon, to define its dimensionless numbers, and highlight the interfacial instability. The Weissenberg effect was also studied at different scales in order to understand the effect of amplification.

Finally, in viscoelastic and shear-thinning fluids, we characterized the flow around an isolated solid inclusion by performing the measurements of velocity fields. These results were used to confirm the viscoelastic origin of the negative wake and to describe its characteristics.